Hypodermic syringe



March 31, 1931. E. P. cREssLER HYPODERMIC SYRNGE Original Filed Jan; 30, 1924 `Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE EDWARD P. CBSSLEB, Ol' NEWTON, KANSAS,I ASSIGNOR TO COOK LABORATORIES, INC., 'n

OF CHICAGO, ILLINOIS, A CORPORATION 0F DELAWARE HYPODERMIC SYRINGE Original application illed January 30, 1924, Serial No. 689,518. Divided and this application iiled March 22, 1928. Serial No. 263,671.

This ap lication is a division of my application ed January 30, 1924, Serial No. 689,518, and now matured into Patent 1,712,070, dated May 7, 1929, relating to hypodermic syringes of the cartridge type.,

The invention described and claimed in my said prior application is illustrated therein as embodied in several specifically different cartridge syringes or injection-ad- 1. ministering organizatio s.

One of said syrin s or organizations, upon which this divisional application is based for the purpose of claiming certain specific subject-matter, is shown in the accompanying drawings, in which:

Flg. l is a longitudinal sectional view of the syringe;

Fig. 2 1s a similar view on a section taken at right angles to the section of Fig. 1;

Fig. 3 is a longitudinal section of part of the instrument body.

Referring to the drawings, a cartridge comprising a glass tube 1 having a fore sealing closure 2 and an inwardly displaceable g5 piston plug 3, is shown in an instrument embodying cartridge-holding and needle-holding means and operating means by which to e'ect the fluid contacts of the cartridge t rough the needle; said cartridge typifying a sealed container of hypodermic iuid adapted for establishing communication with the needle and constructed to have its interior volume reduced for ejecting the i'luid.

In this instance the sealing closure 2 is a iiexible cap of soft rubber or the like fitted ti htly over the fore end of the, cartridge tu e, said cap having a centrally disposed conical cavity 2a in its inner side and a slit 2b in its outer side meeting said cavity. The form and relation of the cavity and slit are such that normally the walls of the slit 2b are pressed tightly together. When pressure is imposed on the liquid in the cartridge, 45 by forcing in the piston plug 3, the sealing cap 2 or its central portion will flex outwardly, so that the walls of the cavity 2 will tend to become parallel and the walls of the slit 2b will separate, thus openin a central assage in the discharge end 0% the cartri ge; 50 but when the pressure is released the cap will reflex or resume its original condition, automatically closing the passage. Hence after adminlstering an injection from the contents of the cartridge through the .hypodermic needle associated therewith, and in case of suction effect in the cartridge created bya rebound or retractive movement of the piston plug or Syringe plunger, there will not be likelihood of drawing blood or other matter from the patients tissue back into the injecting needle or the cartridge.

The piston plug 3 is represented as a composite plug comprising la relatively thicker hard rubber section 3a and a thinner soft rubber section 3", the thicker inner section 3a being tted in the tube so as to slide freely. If after an injecting operation the movement ofthe plunger should reverse, the soft rubber section 3b pressed by the hard rubber section behind it will expand and by its rictional contact with the cartridge tube act with a braking eiiect, tending to resist the rebound.

Referring to the holding and operating instrument, the body thereof is represented by a frame which comprises a rear collar 4 and front collar 5 and longitudinal bars 6 connecting them. The interior diameters of the collars and the space between the bars are in this instance larger than the external diameter of the glass cartridge tube. Both of the collars are externally threaded.

Screwed .on thecollar 5 is a needle-holding member 7. In this instance the hypodermic injecting needle 8 has a funnel head 9, and the member 6 is a screw-cap with a central tapered bore or bevel-edged opening in which the needle-funnel-is sealed, the funnel being held with its mouth against the sealing 90 closure 2 and surrounding the central passage thereof. Thus the mouth of lthe funnel affords an annular abutment cooperating with the rubber cap 2 to control its flexing and to assure discharge of the liquid ejected (from the cartridgeiilito and through the nee- A screw-cap 10 screwed upon the rear collar 4 carries a rigidly attached sleeve 11 movably fitted in said collar, said sleeve being preferably of slightly larger internal diameter than the external diameter of the cartridge and having a pair of tongues or projections `12 extending from its front or inner end. The sleeve also has inwardly projecting lugs 13 adapted by the turning of the breechcap 10 to be brought against the rear or butt end of the cartridge tube and force the cartridge forward against its seat in the needlecarrying member 6. Thus the cartridge will be clamped, with the rubber sealing cap clamped between the member Gand front end of the glass tube, and with said rubber cap held closely against the mouth of the needle funnel 9.

Suitably attached to the rear end of the instrument body are finger pieces 14 to be gripped by the fingers while pressing with the palm of the hand upon the handle 15 of the syringe plunger rod 16. Said plunger rod 16, guided in the cap 10, is shown having a threaded inner end to be screwed into the piston plug 3, the sections of which are shown having holes for that purpose; though it will be understood that the plunger rod may be otherwise engaged with said plug. A stop 17 on the plunger rod limits its outward movement.

To assemble the syringe organization for injection-administering purposes, the breechcap 10 having the attached sleeve 11 may be turned to aline the tongues 12 with the frame bars 4. The cartridge may then be inserted laterally inJ the instrument body and then moved endwise to insert its fore sealing cap 2 in the collar 5. The breech-cap 10 may then be screwed to a position in which the tongues 12 embracing the cartridge tube are preferably at right angles to the frame bars 4, in which position the cartridge is caged; and as the cap l0 is screwed forward to the final position the axial advance of the sleeve 11 will cause the lugs 13 to bear on the butt end of the cartridge and force it forward against the seat or abutment provided by the needle-carrying member 6, so that the cartridge is clam ed as before stated. The plunger rod 16, typifying any suitable plunger for forcing in the piston plug 3, may then be operated to cause the establishment of communication between the cartridge and the needle and the ejection of the fluid by the movement of said piston plug through the tube toward the .plug 2.

It will be understood that the construction described is to be considered an illustrative embodiment of the specific subject-matter herein claimed, which also embodies the broader invention or improvements described and claimed in my said prior application o which this is a division.

Iclaim herein:

1. A hypodermic syringe embodying a cartridge and associated needle, said cartridge comprising a liquid-containing tube having a rear piston plug and a fore sealing closure of resilient material and said needle having a funnel extension held against said closure, the said closure having a normally closed passage openable by pressure imposed on the liquid to establish communication between the liquid and the needle; with a cartridge holder having said needle removably affixed thereto in operative relation to said cartridge, said holder embodying an abutment for the fore cartridge closure and screw-actuated means protruding into the holder against the rear end of the cartridge tube, whereby the cartridge may be clamped between said screw-actuated means and fore abutment with the said fore closure cushioning the fore end of the cartridge tube; and means to force 1n the piston plug to cause opening of the passage to the needle and ejection of the liquid therethrough.

2. A hypodermic syringe embodying a cartridge and associated needle, said cartridge comprising a liquid-containing tube having a rear piston plug and a fore sealing closure of resilient material responsive to pressure imposed on the liquid to establish a discharge passage through said closure and thereby establish communication with the needle; with a cartridge holder having said needle removably affixed thereto in operative relation to said cartridge, said holder constructed to permit lateral insertion of the cartridge and embodying means to retain the inserted cartridge and embodying an abutment for the fore cartridge closure and screw-actuated means to bear against the rear end of the cartridge tube, whereby the cartridge may be clamped between said screw-actuated means vand fore abutment with the said fore closure cushioning the fore end of the cartridge tube; and means to force in the piston plug to cause opening of the passage to the needle and ejection of' the liquid therethrough.

3. A hypodermic syringe comprising, in combination, a cartridge comprising a liquidcontaining tube with a rear piston plug and a resilient fore sealing closure constructed to provide a sealed passage adapted to open under pressure imposed on the liquid; a needle having a funnel extension; and a cartridgeholder embodying a needle-holder holding the needle with the mouth of its funnel seated against the said flexible closure around said passage; said holder having a plunger carrying breech-cap screwed thereon and embodying means to engage the butt end of the cartridge, whereby the cartridge is clamped by means engaging its ends with its fore sealing closure seated in the fore end of the holder and against the mouth of the needle funnel.

4. A hypodermic syringe embodying a cartridge and needle yin operative relation, said cartridge comprising a liquid-containing tube having a rear piston plug and a fore sealing closure responsive to pressure imposed on the liquid to establish a discharge passage through the closure and thereby establish communication with the needle; with associated means holding the cartridge and needle in assembly, and means for forcing in said piston plug; said holding means constructed to permit lateral insertion of the cartridge and to provide a seat for said fore sealing closure and to clamp the cartridge against said seat.

5. A cartridge-holding and operating instrument comprising a frame in which the cartridge is laterally insertible, consisting of longitudinal bars and separate threaded end collars connecting said bars; a needle-holding cap screwed on the front collar providing a ore cartridge abutment; and a plungercarrying breech-cap screwed on the rear collar, said breech-cap having an extension within the holder through which the plunger may operate, said extension adapted to engage the butt end of and thrust the cartridge forward against said abutment.

6. A cartridge-holding and operating instrument comprising a frame in which the cartridge is laterally insertible having threaded end collars; a needle-holding cap screwed on the front collar providing a fore cartridge abutment; and a plunger-carrying breech-cap screwed on the rear collar, said breech-cap having tongues registerable with the frame bars to permit insertion of the cartridge and adapted to be moved out of registration to cage the cartridge.

7. A cartridge-holding and operating instrument in which a cartridge 1s insertible, and which is provided at its fore end with an abutment for the fore end of the cartridge and with means to hold a needle throu h which the contents of the cartrid e is to ie discharged, said instrument aving a plunger-carrying breech-cap screwed on its rear end, said breech-cap embodying a tubuf lar extension adapted to enclose the rear end of the cartridge and said extension having an internal projection adapted to engage the butt end of and thrust the cartridge forward against said abutment.

8. A cartridge-holding and operating instrument in which the cartridge is laterally insertible, having at its fore end an abutment for the fore end of the cartridge and means to hold a needle through which the contents of the cartridge is to bev discharged,

the plunger being movable past said last named means into the cartridge tube.

In testimony whereof, I have signed my name to this s eciiication.

E WARD P. CRESSLER. 

